Cisco MDS 9000 Family Storage Media Encryption Configuration Guide - Release 4.x (OL-18091-01, February 2009)

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Cisco MDS 9000 Family Storage Media Encryption Configuration Guide
OL-18091-01, Cisco MDS NX-OS Release 4.x
APPENDIX
B
Offline Data Recovery in Cisco SME
The Cisco SME solution provides seamless encryption service through a hardware-based encryption
engine. However, when the MSM-18/4 module or the Cisco MDS 9222i fabric switch is not available,
you can use the Offline Data Restore Tool (ODRT).
This appendix describes the basic functionalities and operations of this software application.
About Offline Data Restore Tool
The Offline Data Restore Tool (ODRT) is a standalone Linux application and is a comprehensive
solution for recovering encrypted data on tape volume groups when the MSM-18/4 module or the Cisco
MDS 9222i switch is unavailable. The Offline Data Restore Tool (ODRT) reads the tape volumes,
encrypted by Cisco SME, and decrypts and decompresses the data and then writes clear-text data back
to the tape volumes.
Figure B-1 shows the topology supported by the Offline Data Restore Tool (ODRT).
Figure B-1 Offline Data Restore Tool (ODRT) Topology
The encryption and decryption of data works in the following two steps:
• Tape-to-disk– The Offline Data Restore Tool (ODRT) reads the encrypted data from the tape and
stores it as intermediate files on the disk.
• Disk-to-tape– The Offline Data Restore Tool (ODRT) reads intermediate files on the disk, decrypts
and decompresses (if applicable) the data and writes the clear-text data to the tape.
The decryption key is obtained from the volume group file which you need to export from the Cisco Key
Management Center (KMC). For information on exporting volume groups, see
Chapter 6, “Cisco SME
Key Management.”
The Offline Data Restore Tool (ODRT) feature is invoked by entering the odrt.bin command from the
Linux shell.
A Linux host
running O ffline
Data Restore Tool
SAN
Tape drive with
Cisco SME-encrypted
media
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